Samsung MAX-485 - Troubleshooting Chart; Deck Section

7-3. CASSETTE DECK section
7-3-1. Troubleshooting chart
BLOCK Main FUNCTION CHECK POINT
TAPE IC KIC1 @ Conver of P/B & R/P SIGNAL @ Check for voltage at PIN 27
(KA222920)
&
DECK
Output
of
IC
1
P/B
deck:
H
2 R/P deck; L
@ Check for voltage at PIN 28
1 P/B deck; L
2 R/P deck ; H
nee
@ Check for voltage at PING
When between songs : Low(Normal)
When playing song : High(Normal)
@ Check for signal presence at PIN 1.
AMPS @ AMPS & REPEAT
KIC2(LA2010)
DOLBY NR AMP @ Convert P/B & SOURCE SIGNAL
DIC1(KA2271)
@ Convert DOLBY NR ON/OFF
———
We Check for voltage at PIN 4
P/B mode ; High
R/P mode ; Low
DUBBING mode ; High
@ When in operative UIC1 98PIN CHECK
Mode UIC 198 PIN
P/B mode H
R/P mode L
DUBBING H
@ DIC1 13 CHECK
| Mode | UIC198PIN |
OFF H
ON L
BIAS OSC @ Oscillate RECORD BIAS
(106 kHz)
@ TPWF3 CHECK
Osc Frequency ; 106KHz
@ When inoperative ; LO4, LQ3 CHECK
R/P SWITCHING @ Convert PLAY/RECORD HEAD
@ LOSL, LOS5R, Gate Check
| Mode LO5L,R
REC -10V
PLAY OV
p-COM UIC1 @ Control DECK MECHA
@ Control LCD DISPLAY
e@ Control MUTE circuit
@ Control each circuit
Sf
@ Check for RESET
When power is turned ON.
FL
DISPLAY
@
Drive
FL
DISPLAY
UIC1
@ Check UWF1